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Capacitive Pressure Sensors Containing Reliefs on Solution-Processable Hydrogel Electrodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-05 , DOI: 10.1021/acsami.0c18355
Hongwei Zhou 1 , Mingcheng Wang 1 , Xilang Jin 1 , Hanbin Liu 2 , Jialiang Lai 1 , Haotian Du 1 , Weixing Chen 1 , Aijie Ma 1
Affiliation  

Highly sensitive capacitive-type pressure sensor has been achieved by fabricating reliefs on solution-processable hydrogel electrodes. Hybrid PVA/PANI hydrogels (PVA, poly(vinyl alcohol); PANI, polyaniline) with a fully physically cross-linked binary network are selected as the electrodes of the pressure sensors. On the basis of the solution processability, reliefs are fabricated on the surface of PVA/PANI hydrogel electrodes by a template method. The gauge factor (GF) is enhanced by introducing reliefs and regulated by controlling the composition and relief dimension of hydrogel electrodes. The optimized pressure sensor containing reliefs achieves the highest GF of 7.70 kPa–1 and a sensing range of 0–7.4 kPa. Furthermore, the freezing and drying problems of the hydrogel sensors are overcome by introducing a binary solvent of water/glycerol and the pressure sensing ability at −18 °C has been achieved. Finally, monitoring of various pressures in daily life, such as joint bending, blowing, and brush writing, is demonstrated using such pressure sensors.

中文翻译:

电容式压力传感器,在溶液可处理的水凝胶电极上具有浮雕

通过在溶液可处理的水凝胶电极上制作浮雕,可以实现高灵敏度的电容式压力传感器。具有完全物理交联的二元网络的混合PVA / PANI水凝胶(PVA,聚乙烯醇; PANI,聚苯胺)被选作压力传感器的电极。基于溶液的可加工性,通过模板法在PVA / PANI水凝胶电极的表面上制造浮雕。通过引入浮雕来提高规格系数(GF),并通过控制水凝胶电极的组成和浮雕尺寸来进行调节。经过优化的包含浮雕的压力传感器实现了7.70 kPa –1的最高GF感应范围为0–7.4 kPa。此外,通过引入水/甘油的二元溶剂克服了水凝胶传感器的冷冻和干燥问题,并且已经实现了在-18°C的压力感应能力。最后,使用这种压力传感器演示了对日常生活中各种压力(例如关节弯曲,吹气和毛笔书写)的监视。
更新日期:2021-01-13
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